TESTING/LIN/cgtt01.f(3)

NAME
TESTING/LIN/cgtt01.f

SYNOPSIS

  Functions/Subroutines
subroutine cgtt01 (n, dl, d, du, dlf, df, duf, du2, ipiv, work, ldwork, rwork, resid)
CGTT01

Function/Subroutine Documentation

  subroutine cgtt01 (integer n, complex, dimension( * ) dl, complex, dimension( * ) d, complex, dimension( * ) du, complex, dimension( * ) dlf, complex, dimension( * ) df, complex, dimension( * ) duf, complex, dimension( * ) du2, integer, dimension( * ) ipiv, complex, dimension( ldwork, * ) work, integer ldwork, real, dimension( * ) rwork, real resid)

CGTT01

Purpose:

    !>
    !> CGTT01 reconstructs a tridiagonal matrix A from its LU factorization
    !> and computes the residual
    !>    norm(L*U - A) / ( norm(A) * EPS ),
    !> where EPS is the machine epsilon.
    !>

Parameters
    N

    !>          N is INTEGER
    !>          The order of the matrix A.  N >= 0.
    !>

    DL

    !>          DL is COMPLEX array, dimension (N-1)
    !>          The (n-1) sub-diagonal elements of A.
    !>

    D

    !>          D is COMPLEX array, dimension (N)
    !>          The diagonal elements of A.
    !>

    DU

    !>          DU is COMPLEX array, dimension (N-1)
    !>          The (n-1) super-diagonal elements of A.
    !>

    DLF

    !>          DLF is COMPLEX array, dimension (N-1)
    !>          The (n-1) multipliers that define the matrix L from the
    !>          LU factorization of A.
    !>

    DF

    !>          DF is COMPLEX array, dimension (N)
    !>          The n diagonal elements of the upper triangular matrix U from
    !>          the LU factorization of A.
    !>

    DUF

    !>          DUF is COMPLEX array, dimension (N-1)
    !>          The (n-1) elements of the first super-diagonal of U.
    !>

    DU2

    !>          DU2 is COMPLEX array, dimension (N-2)
    !>          The (n-2) elements of the second super-diagonal of U.
    !>

    IPIV

    !>          IPIV is INTEGER array, dimension (N)
    !>          The pivot indices; for 1 <= i <= n, row i of the matrix was
    !>          interchanged with row IPIV(i).  IPIV(i) will always be either
    !>          i or i+1; IPIV(i) = i indicates a row interchange was not
    !>          required.
    !>

    WORK

    !>          WORK is COMPLEX array, dimension (LDWORK,N)
    !>

    LDWORK

    !>          LDWORK is INTEGER
    !>          The leading dimension of the array WORK.  LDWORK >= max(1,N).
    !>

    RWORK

    !>          RWORK is REAL array, dimension (N)
    !>

    RESID

    !>          RESID is REAL
    !>          The scaled residual:  norm(L*U - A) / (norm(A) * EPS)
    !>

Author
    Univ. of Tennessee

    Univ. of California Berkeley

    Univ. of Colorado Denver

    NAG Ltd.

Definition at line 132 of file cgtt01.f.

Author

Generated automatically by Doxygen for LAPACK from the source code.